Influence of High-Concentration LLDPE on the Manufacturing Process and Morphology of Pitch/LLDPE Fibres

Abstract

A high modulus of elasticity is a distinctive feature of carbon fibres produced from mesophase pitch. In this work, we expand our previous study of pitch/linear low-density polyethylene blend fibres, increasing the concentration of the linear low-density polyethylene in the blend into the range of from 30 to 90 wt%. A scanning electron microscope study showed two distinct phases in the fibres: one linear low-density polyethylene, and the other pitch fibre. Unique morphologies of the blend were observed. They ranged from continuous microfibres of pitch embedded in linear low-density polyethylene (occurring at high concentrations of pitch) to a discontinuous region showing the presence of spherical pitch nodules (at high concentrations of linear low-density polyethylene). The corresponding mechanical properties—such as tensile strength, tensile modulus, and strain at failure—of different concentrations of linear low-density polyethylene in the pitch fibre were measured and are reported here. Thermogravimetric analysis was used to investigate how the increased linear low-density polyethylene content affected the thermal stability of linear low-density polyethylene/pitch fibres. It is shown that selecting appropriate linear low-density polyethylene concentrations is required, depending on the requirement of thermal stability and mechanical properties of the fibres. Our study offers new and useful guidance to the scientific community to help select the appropriate combinations of linear low-density polyethylene/pitch blend concentrations based on the required mechanical property and thermal stability of the fibres.

Fabrication of LLDPE based biodegradable composite incorporated with leather shavings and buffing dust: An approach for waste management

“…Slight rough interface of LS‐10 composite film may be observed for fiber‐fiber interaction in LS, weak bonding between long fibers of LS and LLDPE 4,5,31 . Suitable filler matrix ratio and other processing variables in extrusion process like screw profiles, screw speed and feeding rate are critical to prevent the agglomeration of fibers and getting a uniform fiber/matrix interaction 35,36,44–46 . The surface morphology of those fabricated composite films validates uniformity of the surface and better interactions between LB‐LLDPE and LS‐LLDPE.…”

Interdependencies between Dynamic Response and Crack Growth in a 3D-Printed Acrylonitrile Butadiene Styrene (ABS) Cantilever Beam under Thermo-Mechanical Loads

“…The effect of thermal loading on the dynamic response was evaluated by varying the ambient temperature to 50, 60 and 70 °C. The temperature range was determined by a Differential Scanning Calorimetry (DSC) test as in previous studies [ 56 , 57 , 58 ]. A Mettler Toledo Differential Scanning Calorimeter, DSC Q 2000 (Columbus, OH, USA), was used to measure the glass transition temperature of Ultimaker red ABS.…”